A Nitroxide Radical Conjugated Polymer as an Additive to Reduce Nonradiative Energy Loss in Organic Solar Cells

Furong Shi, Pengzhi Guo, Xianfeng Qiao, Guo Yao, Tao Zhang, Qi Lu, Qian Wang, Xiaofeng Wang, Jasurbek Rikhsibaev, Ergang Wang, Chunfeng Zhang, Young Wan Kwon, Han Young Woo, Hongbin Wu, Jianhui Hou, Dongge Ma, Ardalan Armin, Yuguang Ma, Yangjun Xia

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Nonfullerene-acceptor-based organic solar cells (NFA-OSCs) are now set off to the 20% power conversion efficiency milestone. To achieve this, minimizing all loss channels, including nonradiative photovoltage losses, seems a necessity. Nonradiative recombination, to a great extent, is known to be an inherent material property due to vibrationally induced decay of charge-transfer (CT) states or their back electron transfer to the triplet excitons. Herein, it is shown that the use of a new conjugated nitroxide radical polymer with 2,2,6,6-tetramethyl piperidine-1-oxyl side groups (GDTA) as an additive results in an improvement of the photovoltaic performance of NFA-OSCs based on different active layer materials. Upon the addition of GDTA, the open-circuit voltage (VOC), fill factor (FF), and short-circuit current density (JSC) improve simultaneously. This approach is applied to several material systems including state-of-the-art donor/acceptor pairs showing improvement from 15.8% to 17.6% (in the case of PM6:Y6) and from 17.5% to 18.3% (for PM6:BTP-eC9). Then, the possible reasons behind the observed improvements are discussed. The results point toward the suppression of the CT state to triplet excitons loss channel. This work presents a facile, promising, and generic approach to further improve the performance of NFA-OSCs.

Original languageEnglish
Article number2212084
JournalAdvanced Materials
Volume35
Issue number23
DOIs
Publication statusPublished - 2023 Jun 8

Bibliographical note

Funding Information:
F.S., P.G., and X.Q. contributed equally to this work. This work was supported by the Industrial Guidance Project for Colleges and Universities of Gansu Province (2020C‐07), the National Nature Science Foundation of China (62164007 and 51903112), and Tianyou Youth Talent Lift Program of Lanzhou Jiaotong University. H.Y.W. acknowledges the financial support from the National Research Foundation (NRF) of Korea (2019R1A2C2085290 and 2019R1A6A1A11044070). E.W. acknowledges the financial support from the K&A Wallenberg Foundation (2017.0186 and 2016.0059), the Swedish Energy Agency (P2021‐90067), the Swedish Research Council (2016‐06146 and 2019‐04683), and Formas. X.F.Q. acknowledges the Open Project Program of Wuhan National Laboratory for Optoelectronics (No. 2019WNLOKF016). A.A. is a Sêr Cymru II Rising Star Fellow and acknowledges EPSRC Program Grant EP/T028511/1 Application Targeted Integrated Photovoltaics. Y.X. gratefully acknowledges the support from the Instrument Analysis Center of Lanzhou Jiaotong University.

Publisher Copyright:
© 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.

Keywords

  • low-lying triplets
  • nitroxide radical conjugated polymers
  • nonradiative energy loss
  • organic solar cells
  • solid additives

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint

Dive into the research topics of 'A Nitroxide Radical Conjugated Polymer as an Additive to Reduce Nonradiative Energy Loss in Organic Solar Cells'. Together they form a unique fingerprint.

Cite this